Hi. I got a but report about a dumpfs FUSE filesystem reporting bad mount output. The same problem affects other pseudo file systems not listed in mnt_fstype_is_pseudofs(): # mount | grep encfs encfs on /Encrypted type fuse.encfs (rw,nosuid,nodev,relatime,user_id=10027,group_id=100,default_permissions) # mkdir encfs # mount | grep encfs /root/encfs on /Encrypted type fuse.encfs (rw,nosuid,nodev,relatime,user_id=10027,group_id=100,default_permissions) ^^^^^^^^^^^ Debugging shows two reasons why it happens: 1) encfs is not listed in mnt_fstype_is_pseudofs() 2) mnt_resolve_path() calls canonicalize_path_and_cache() on the kernel output, which makes only a little sense Currently I am aware of three file systems affected at least (i. e. not listed): gvfs (subtype was renamed from gvfs-fuse-daemon to gvfsd-fuse), encfs, dumpfs. Easy fix would be adding all of them to the list. But probably much more exists. More complex would allow to add fuse.*. But it is not correct, because FUSE can be a regular file system based on block device (e. g. fuse ntfs). Yes, such reports "fuseblk" as a default. But still, it can be changed. That is why I started thinking about the better fix than adding these three to the list: If the column 10 (mount source) of a particular line of /proc/<pid>/mountinfo does not start by "/", then it is a pseudofs. Actually, it could be generalized: - If it does not contain "/" (or maybe another character) at all, it is a pseudofs. - If it contains "/" (or maybe another character), but it does not start by it, it is a network file system. - If it starts by "/", it is a regular file system. Before implementing, I want to make a wider discussion, whether it could work. I talked with a kernel developers, and he told that there is no solution "correct by principle". Filesystem developer can provide virtually anything as a source. But it could work in most cases. What do you think about such change? And additionally: Does canonicalization of the kernel output make any sense? If not, it could be skipped for commands like a bare "mount". (But I am not sure how complicated it would be.) -- Best Regards / S pozdravem, Stanislav Brabec software developer --------------------------------------------------------------------- SUSE LINUX, s. r. o. e-mail: sbrabec@xxxxxxxx Křižíkova 148/34 (Corso IIa) tel: +420 284 084 060 186 00 Praha 8-Karlín fax: +420 284 084 001 Czech Republic http://www.suse.cz/ PGP: 830B 40D5 9E05 35D8 5E27 6FA3 717C 209F A04F CD76
